Back component for a chair



FIG. 1 is a front perspective view of a back component for a chair embodying the present invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side view therof, the left side being a mirror image thereof; and,

FIG. 7 is a bottom view thereof.

The dashed lines in FIGS. 1-7 show environment structure and do not form a part of the design sought to be patented. 

The ornamental design for a back component for a chair, as shown and described. 